Pitman construction



Feb. 7, 1933.

J. R, MAHAN 1,896,549

PITMAN CONSTRUCTION Filed Oct. 29, 1930 III 14' Patented Feb. 7, 1933 UNITED STATES PATENT. OFFICE JOSEPH R. MAHAN, or ronnno, OHIO, ASSIGNOR To :THE, NATIONALSUPPILY co rANYf' or TOLEDO, 01110, A CORPORATION or OHIO Y PITMAN ooivsanuoriolv Application filed October 29, 1138b. Serial No. [491,903. b i q My invention relates to pitman constructions and particularly to those provided with means for quickly separating the bearing members from the wrist pin.

One object of this invention is to provide an improved bearing means for the movable wrist pin bearing member. Another object is to provide a frame comprising a yoke secured to an I-beam having its web modified to form guides and retaining means for the bearing members of the pitman. Another object is to provide a novel means for holding the non-traveling bearing member in place and at the same time allow it limited rocking movement. Other objects appear hereinafter.

Referring to the accompanying drawing, Fig. 1 is a side elevation of one end of a pitman embodying my invention; Fig. 2 is a central vertical section of Fig. 1, parts being shown in elevation; Fig. 3, a section on the line 33 on Fig. 1; Fig. 4, a section on the line 4-4 on Fig. 1; and Fig. 5, a section on the line 55 on Fig. 1.

U-shaped yoke welded or otherwise rigidly connected to the flanges 2 of the I-beam 3 having the web 4. The web 4 is partially cut away from the point 5 down to the line 6, the web from this point extending down into the rounded portion of the yoke at the lower end of the pitman. The portions of the webnext to the flanges 2 and along the sides of the opening 7 are left by the removal of the said cut-out parts. The said portions constitute member 9 for the wrist pin 27. The bearing member 9 has at each side a slot 10 to receive the respective guides 8. The lower face of the bearing member 9 is arc-shaped to fit the said wrist pin.

11 is the non-traveling bearing member for the wrist pin and like the member 9 is seated between the flanges 2 and has at its sides the grooves 12 to receive the guides 8. The

guides are omitted from points just below the top of the member 11 down to the line 6,

the member 11 occupying the space between the flanges 2 at this place. The member 11 is provided with the opening 13 in which the On the drawing, 1 designates an elongated guiding ribs 8 for the bearing 1 pin ,14 issecured by means of the cotterpin 15.

The ends ofthepinv 14 have their hearingmembers in the sides of the'loop 1 and the adjacent flanges 2. The upper face of the member 11 is arc-shaped and opposed to the arc-shaped face of the member 9.

The bottom of the web portion at the point 5 supports the. hanger 16 by means of the bolts 17 which pass through the web and the upper end ofthe hanger. The hanger has a recess 18 to receivethe. web at the point 5. This recess braces the hanger so as to prevent its movements transversely of the web.

The hand lever 19 is fulcrumed on the pivot pin 20 carriedby the hanger 16. The lever carries between the pivot pin 20 and the member 9 the pivot pin 21 to which one end of the link 22 is connected, the other end of the link being connected to the member 9," j by the pivot pin 23. The link 22 is shown to be of the turn-buckle type. The link 22 and the arm 24 on the lever between the pivot pins 20 and'21 constitute a -pair'offtoggle members, the arrangement being such that when the'lever is in the position shown in full lines the toggle members are in their extended -position whichcauses the'member 9 to be held rigidly in contact with thewrist pin which also is seated in the member 11. Whenthe. lever 19 is moved to the position shown in 30 dotte'dlines the bearing member 9 will be moved so as to free the wrist pin. In' this position of the lever 19 it may be held by the bail 25 as shown in dotted lines on Fig. 2.

The flanges 2 terminate a short distance '85 below the line 6. Just below, the lower'e'nd 'ofthe flanges 2 I secure in any suitable manner, as by'welding, the legs of-the U-shaped handle 26." i I The bearing blocks 9 and 11 have their pivotal axes parallel so that these blocks may automatically keep in perfect alinement with the wrist pin at all times. There is suflicient room in the groovesv 10 and 12 to allow the. bearing members9 and 11 to rock transversely of the ribs and adjust themselves in alinement with the wrist pin 27 The described end of the pitman has an open frame work provided with the guide ribs 8 at the opposing sides of the opening 7.

I claim 1. In a pitman construction, a frame work comprising a U-shaped terminal member, an I-beam having the outer faces of its flanges secured to the inner opposing faces of the U-shaped member, a portion of the web of the I-beam being removed to leave opposing ribs, a traveling wrist pin bearing slidable astride the ribs and having lateral movement transversely thereof and limited thereby, a nontraveling wrist pin bearing opposite the first bearing, a pivotal support for the second bearing, and means providing limited pivotal movement thereof transversely of the ribs.

2. In a pitman construction, a frame work comprising a U-shaped terminal member, an I-beam having the outer faces of its flanges secured to the inner opposing faces of the U-shaped member, a portion of the web of the I-beam being removed to leave opposing ribs, a traveling wrist pin bearing slidable astride the ribs and having limited lateral movement transversely thereof, a non-traveling wrist pin bearing opposite the first bearing, and a pivotal support for the second bearing, the latter bearing having in its edges grooves to receive the ribs and to permit limited pivotal movement of the bearing transversely of the ribs.

3. In a pitman construction, an I-beam having a portion of its web removed to provide opposing ribs, a traveling Wrist pin bearing having grooves guided by the ribs, a hanger attached to the web and positioned in the opening left by the removal of the said portion of the web, and a lever pivotally carried by the hanger and a link pivotally attached to the bearing and to the lever for operating the member.

4. In a pitman construction, an I-beam having a portion of its webs removed to provide opposing ribs, a traveling wrist pin bearing having slots at its opposite edges loosely straddling the ribs and guided thereby, a second wrist pin bearing opposite the first bearing and having grooves in its opposite edges loosely straddling the ribs and providing limited movement thereof transversely of the ribs, a lever fulcrumed at one end by means attached to the web and positioned in the opening left by the removal of the said portion of the web, and a link connecting the first bearing and the intermediate point of the lever, the link and the lever forming a toggle connection for operating the first bearing away from the second bearing and for locking the first hearing to retain a wrist pin between the bearings.

In testimony whereof, I hereunto affix my signature.

JOSEPH R. MAI-IAN. 

